Free/Libre Open Source Software
From wikipedia : https://en.wikipedia.org/wiki/Free_and_open_source_software
Free and open-source software (FOSS) is computer software that can be classified as both free software and open-source software. That is, anyone is freely licensed to use, copy, study, and change the software in any way, and the source code is openly shared so that people are encouraged to voluntarily improve the design of the software. This is in contrast to proprietary software, where the software is under restrictive copyright and the source code is usually hidden from the users.
In 2001, the European Commission (EC) first used the phrase FLOSS (Free/Libre and Open-Source Software) in a study they funded prepared under the leadership of Rishab Ghosh.
Unlike libre software, which aimed to solve the ambiguity problem, FLOSS aimed to avoid taking sides in the debate over whether it was better to say "free software" or to say "open-source software".
Proponents of the term point out that parts of the FLOSS acronym can be translated into other languages, with for example the F representing free (English) or frei (German), and the L representing libre (Spanish or French), livre (Portuguese), or libero (Italian), liber (Romanian) and so on. However, this term is not often used in official, non-English, documents, since the words in these languages for free as in freedom do not have the ambiguity problem of free in English.
By the end of 2004, the FLOSS acronym had been used in official English documents issued by South Africa, Spain, and Brazil.